It's worth adding that issues with the SBS braking system can occur on these cars and often Mercedes will do a goodwill claim even on cars well out of warranty, so just remember that after you've paid for a good independant (like prestige) to diagnose if it's something expensive asking a MB dealer to see if MB will do a goodwill claim is probably worth trying.

I had 90% of a SBS issue paid for under MB UK goodwill on a 5 year old car earlier in the year.

Richard